pvi, vii, 4 Idea design – © Johavel/istockphoto.com

pvi, vii, 4 Bubbles for speech – © Ferdiperdozniy/istockphoto.com

pviii, ix, 100 Bulb idea – © Johavel/istockphoto.com

p2, 23 Brain – © Tortuga/shutterstock.com

p2 Bonsai – © Prodepran/istockphoto.com

p6 Happy businessman with checklist – © Antoniu/istockphoto.com

p8 Abstract 2015 calendar template – Kaca1 © /istockphoto.com

p15 Positive thinking – © Nuranvectorgirl/istockphoto.com

p16, 17 Human cells – © Ttsz/istockphoto.com

p21 Help – © Suat Gürsözlü/istockphoto.com

p23 Legs – © RamCreativ/istockphoto.com

p27 Musical notes – © Gun2becontinued/istockphoto.com

p34 Switch – © Vertyr/istockphoto.com

p41 Black cat in a bunny suit © Vivienstock/thinkstockphotos.co.uk

p49 Silhouette street violinist – © Aarrows/istockphoto.com

p51 Savings – © Nousha/istockphoto.com

p55 Man with loudspeaker – © Puruan/istockphoto.com

p56 Businessman debt – © Wissanu99/istockphoto.com

p58 Businessman listening to music – © Jack191/istockphoto.com

p59 Pudding jelly – © Yitewang/istockphoto.com

p63 Arrow background – © Mattjeacock/istockphoto.com

p65 Calendar – © Dacian_G/istockphoto.com

p65 Stopwatch – © Gheatza/istockphoto.com

p68 Notepad and pen – © Gmast3r/istockphoto.com

p81 Question mark created from cog wheels – © Muuraa/istockphoto.com

p90 Ballpoint pen – © Vtis/istockphoto.com

p92 Light bulb with long wire – © Owat Tasai/istockphoto.com

p95 Boiled egg – © SimonDGCrinks/istockphoto.com

p98 Creativity – © Erhui1979/istockphoto.com

p98 Pen – © Anthonycz/istockphoto.com

p102, 103 Vector arrows © -Slav-/istockphoto.com

p106 Marathon banner – © Pialhovik/istockphoto.com

p111 Think different – © Mack2happy/istockphoto.com

p113 Brain and cloud – © Dr911/istockphoto.com

p115 Puzzle design – © Jemastock/istockphoto.com

p122, 123 Scribble black bubbles – © Artishokcs/istockphoto.com

p134 Breaking the wall – © Ojogabonitoo/istockphoto.com

p144 Ajar door light beam concept – © ChrisGorgio/istockphoto.com

p145 Blank Rubik's cube – © ARTWatcharapong/istockphoto.com

p146 Grunge white and black brick wall – © Angel_1978/istockphoto.com

p148 Colorful footprints border – © FreeSoulProduction/istockphoto.com

p150 Slide to unlock icon – © Furtaev/istockphoto.com

p153 Person daydreaming – © Noedelhap/istockphoto.com

p155 Good night – © Cotyledons/istockphoto.com

p157 Business man dreaming – © iNueng/istockphoto.com

p159 Rubber duck – © Richardburditt/istockphoto.com

p167 Time is money – © Liravega/istockphoto.com

p170 Book story with child and tree – © Locotearts/istockphoto.com

p170 Summer tree – © Kudryashka/istockphoto.com

Illustrations by Curtis Allen: p13, 25, 30, 39, 47, 61, 89, 109, 125, 129, 141

All other visuals and page design by Andy Prior Design Ltd