This scene is the alarm clocks scene used for Figure 7 in "Stochastic Progressive Photon Mapping" by Hachisuka et al. SIGGRAPH Asia 2009, and the clock model is from ShareCG.com.

Permission to use the model/scene for non-commercial purposes is granted as long as proper credit is given. For example, put "The alarm clocks scene in Figure X is from Hackisuka et al. [2009]." in the acknowledgement section of your paper.