We wish to thank the following people for the images:

• Fora do Eixo
• RL Johnson
• Daniele Zedda
• Daniele Zedda
• John Steven Fernandez
• xvire1969
• AllansBrain
• Sara Cimino
• soundman1024
• Gagilas
• Symic
• rolands.lakis
• rolands.lakis
• Mike
• alicjacolon
• Michael Sevilla
• Meng To
• FireArt Studio

Flat Design Icons from Pixeden (Vol 1, Vol 2, Vol 3, Vol 4).