Wow great photos and striking colours of the monks robes! Thanks for sharing!
Offering of dana is a practice of generosity, which is one of the antidotes to the 3 poisons. It paves the way towards selflessness. "Dana" means alms-giving of basic necessities such as food, clothing, money etc to monks, needy persons or family members. As with all deeds, merit arises from offering dana when intention of the action is noble, and is not merely based on the action itself.
There are 6 kinds of dana and their resultant benefit are as follows (http://www.thisismyanmar.com/nibbana/vasava01.htm
1. Offering of alms-food amounts to offering of vitality and strength.
2. Offering of clothing and robes amounts to offering of pleasant appearances.
3. Offering of vehicle and conveyance amounts to offering of happiness and comfort
4. Offering of light (as of candles, lamps, electrical energy etc.) amounts to offering of eyes (visual capacity).
5. Offering of dwellings, lodgings, rest houses and monastic buildings amounts to offering of all the four gifts
6. Offering of Dhamma by preaching, admonishing or distributing and propagating scriptures doctrinal books etc., amounts to offering of Nibbana bliss - deliverance from all suffering.
Speaking of the act of giving / sharing, I did this little experiment where I gave out candies to young children who walked past me at a public area during an event. Most would take one candy for themselves, very few would take more than one, and none thought taking one candy for their parent(s) or sibling(s). However when I told them to "take one candy for mummy / daddy" they would do it without hesitation and very gleefully. Almost half of parents would reject the candy, but when I told them to "take it, it teaches the children how to give / share what they like" most would immediately take the candy. I found this rather interesting